I just broke out my 02 WR426 from the garage. It ran great when I shut it off in November. It starts and runs well but seems to be sporatically "missing". As I hold the throttle in 2nd or 3rd gear it lurches forward and back like it is having a hard time getting a stable fuel/air mixture. I was wondering if I had bad gas, condensation, or bad plug as an easy fix. Does anyone recommend some tips?